package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import io.jsonwebtoken.lang.Collections;
import lombok.extern.slf4j.Slf4j;
import net.bytebuddy.asm.Advice;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        // 处理各种业务异常（地址簿为空，购物车数据为空）
        // 查询地址簿是否为空
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null)
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        // 检查用户购物车是否为空
        Long userId = BaseContext.getCurrentId();
        ShoppingCart cart = new ShoppingCart();
        cart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(cart);
        if (shoppingCartList == null || shoppingCartList.isEmpty())
            throw new AddressBookBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);

        // 向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);  // 未付款
        orders.setStatus(Orders.PENDING_PAYMENT);  // 待付款
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);
        orders.setAddress(addressBook.getProvinceName()
                + addressBook.getCityName()
                + addressBook.getDistrictName()
                + addressBook.getDetail());
        orderMapper.insert(orders);

        // 向订单明细表插入n条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();
        for (ShoppingCart shoppingCart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(shoppingCart, orderDetail);
            orderDetail.setOrderId(orders.getId());  // 设置当前订单明细关联的订单ID
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);

        // 清空购物车数据
        shoppingCartMapper.deleteById(userId);

        // 封装VO返沪结果
        return OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal(0.01), //支付金额，单位 元
//                "苍穹外卖订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );

        JSONObject jsonObject = new JSONObject();
        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        // 根据订单号查询当前用户的该订单
        Orders ordersDB = orderMapper.getByNumberAndUserId(ordersPaymentDTO.getOrderNumber(), userId);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.TO_BE_CONFIRMED);
        orders.setPayStatus(Orders.PAID);
        orders.setCheckoutTime(LocalDateTime.now());
//        Orders orders = Orders.builder()
//                .id(ordersDB.getId())
//                .status(Orders.TO_BE_CONFIRMED) // 订单状态，待接单
//                .payStatus(Orders.PAID) // 支付状态，已支付
//                .checkoutTime(LocalDateTime.now()) // 更新支付时间
//                .build();

        orderMapper.update(orders);

        // 通过websocket向客户端浏览器推送消息
        Map map = new HashMap();
        map.put("type", 1);  // 1表示来单提醒 2表示客户催单
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号：" + ordersDB.getNumber());

        String json = JSONObject.toJSONString(map);
        webSocketServer.sendToAllClient(json);

        // 清空购物车
        log.info("当前用户id：{}", userId);
        shoppingCartMapper.deleteById(userId);

        return vo;
    }

    /**
     * 历史订单查询
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    @Override
    public PageResult page(int pageNum, int pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        // 分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        if (page != null && !page.isEmpty()) {
            for (Orders orders : page) {
                Long orderId = orders.getId();  // 订单id

                // 查询订单明细
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetailList);
                list.add(orderVO);
            }
        }

        return new PageResult(page.getTotal(), list);

    }

    /**
     * 订单详情查询
     *
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id) {
        // 根据id查询订单
        Orders orders = orderMapper.getById(id);

        // 查询该订单对应的菜品/套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将该订单及其详情封装到VO对象
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;

    }

    /**
     * 取消订单
     *
     * @param id
     */
    @Override
    public void userCancelById(Long id) {
        Orders ordersDB = orderMapper.getById(id);

        if (ordersDB == null) throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        if (ordersDB.getStatus() > 2) throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        // 退款逻辑
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            log.info("退款");
            orders.setPayStatus(Orders.REFUND);
        }

        // 更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     *
     * @param id
     */
    @Override
    public void repetition(Long id) {
        Long userId = BaseContext.getCurrentId();

        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(orderDetail -> {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(orderDetail, shoppingCart);
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());
            return shoppingCart;
        }).toList();

        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 条件分页查询
     *
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 各个状态的订单数量统计
     *
     * @return
     */
    @Override
    public OrderStatisticsVO getStatistics() {
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        return OrderStatisticsVO.builder()
                .toBeConfirmed(toBeConfirmed)
                .confirmed(confirmed)
                .deliveryInProgress(deliveryInProgress)
                .build();
    }

    /**
     * 接单
     *
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     *
     * @param ordersRejectionDTO
     */
    @Override
    public void reject(OrdersRejectionDTO ordersRejectionDTO) {
        Orders orderDB = orderMapper.getById(ordersRejectionDTO.getId());

        if (orderDB == null || !orderDB.getStatus().equals(Orders.TO_BE_CONFIRMED))
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);

        // 退款逻辑
        Integer payStatus = orderDB.getPayStatus();
        if (payStatus.equals(Orders.PAID)) log.info("拒单退款：{}", orderDB);

        Orders orders = new Orders();
        orders.setId(orderDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 取消订单
     *
     * @param ordersCancelDTO
     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus.equals(Orders.PAID))
            log.info("取消订单退款：{}", ordersDB);

        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .cancelReason(ordersCancelDTO.getCancelReason())
                .cancelTime(LocalDateTime.now())
                .status(Orders.CANCELLED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 派送订单
     *
     * @param id
     */
    @Override
    public void delivery(Long id) {
        Orders orderDB = orderMapper.getById(id);
        if (orderDB == null || !orderDB.getStatus().equals(Orders.CONFIRMED))
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);

        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.DELIVERY_IN_PROGRESS)
                .deliveryTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 完成订单
     *
     * @param id
     */
    @Override
    public void complete(Long id) {
        Orders orderDB = orderMapper.getById(id);
        if (orderDB == null || !orderDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS))
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);

        Orders orders = Orders.builder()
                .id(id)
                .status(Orders.COMPLETED)
                .deliveryTime(LocalDateTime.now())
                .build();
        orderMapper.update(orders);
    }

    /**
     * 客户催单
     *
     * @param id
     */
    @Override
    public void reminder(Long id) {
        Orders orderDB = orderMapper.getById(id);

        if (orderDB == null)
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);

        Map map = new HashMap();
        map.put("type", 2);  // 客户催单
        map.put("orderId", id);
        map.put("content", "订单号：" + orderDB.getNumber());

        // 通过websocket向客户端浏览器推送消息
        webSocketServer.sendToAllClient(JSONObject.toJSONString(map));
    }

    /**
     * 返回订单详细菜品信息
     *
     * @param page
     * @return
     */
    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!Collections.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到orderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishes(orders);

                // 将订单菜品信息封装到orderVO，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }

        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishes(Orders orders) {
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条菜品信息拼接为字符串（格式：宫保鸡丁*3）
        List<String> orderDishlList = orderDetailList.stream().map(orderDetail -> {
            String orderDish = orderDetail.getName() + "*" + orderDetail.getNumber();
            return orderDish;
        }).toList();

        // 将对应菜品信息拼接在一起
        return String.join("", orderDishlList);
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
//    public void paySuccess(String outTradeNo) {
//
//        // 根据订单号查询订单
//        Orders ordersDB = orderMapper.getByNumber(outTradeNo);
//
//        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
//        Orders orders = Orders.builder()
//                .id(ordersDB.getId())
//                .status(Orders.TO_BE_CONFIRMED)
//                .payStatus(Orders.PAID)
//                .checkoutTime(LocalDateTime.now())
//                .build();
//
//        orderMapper.update(orders);
//    }
}
